An output match design method for high efficiency and broadband class-J PA

2014 ◽  
Author(s):  
Li Ma ◽  
Fei You ◽  
Xianyun Hou
Keyword(s):  
High Efficiency ◽  
Design Method

The Design of 5V/100W High Frequency Switching Power Supply

2013 ◽  
Vol 834-836 ◽  
pp. 1221-1224
Author(s):  
Hong Zhuan Cai ◽  
Li Bai
Keyword(s):  
Power Supply ◽  
High Frequency ◽  
High Efficiency ◽  
Design Method ◽  
Switching Power Supply ◽  
Widespread Application ◽  
Forward Converter ◽  
Switching Power ◽  
Dc Power ◽  
Important Field

Switching power supply is an important field of application of power electronic technology, the high frequency switching DC power supply with high efficiency, small size, light weight and other advantages obtain the widespread application. The application of synchronous rectifier technology, photoelectric coupling isolation technology and the active clamp forward converter design high frequency switching power supply with 16~40V DC input and 5V/100W DC output . its operational principle is analyzed, and using LM5026 control chip describes design method of switching power supply.

Development of a New Design Method for High Efficiency Swept Low Pressure Axial Fans With Small Hub/Tip Ratio

2014 ◽  
Author(s):  
Thore Bastian Lindemann ◽  
Jens Friedrichs ◽  
Udo Stark
Keyword(s):  
High Efficiency ◽  
Design Method ◽  
Tangential Velocity ◽  
Pressure Rise ◽  
Low Pressure ◽  
Aerodynamic Performance ◽  
Low Noise ◽  
Angle Distribution ◽  
Sweep Angle ◽  
Reduced Pressure

For a competitive low pressure axial fan design low noise emission is as important as high efficiency. In this paper a new design method for low pressure fans with a small hub to tip ratio including blade sweep is introduced and discussed based on experimental investigations. Basis is an empirical axial and tangential velocity distribution at the rotor outlet combined with a distinctive sweep angle distribution along the stacking line. Several fans were designed, built and tested in order to analyze the aerodynamic as well as the aeroacoustic behavior. For the aerodynamic performance particular attention was paid to compensate the influence of reduced pressure rise and efficiency due to increasing blade sweep. This was achieved by a method of increasing the blade chord depending on the local sweep angle which is based on single airfoil data. The tested fans without this compensation revealed a significant noise reduction effect of up to approx. 6 dB(A) for a tip sweep angle of 64° which was accompanied by an unsatisfactory effect of reduced overall aerodynamic performance. The second group of fans did not only confirm the method of the aerodynamic compensation by a nearly unchanged pressure rise and efficiency characteristic but also revealed an increased aeroacoustic benefit of in average 9.5 dB(A) compared to the unswept version. Beside the overall characteristics the individual differences between the designs are also discussed using results of wall pressure measurements which show some significant changes of the blade tip flow structure.

High-efficiency antenna-to-antenna polarization converters for customized polarization angle deflection

2020 ◽  
Vol 12 (7) ◽  
pp. 688-694
Author(s):  
Manlan Deng
Keyword(s):  
High Efficiency ◽  
Design Method ◽  
Ring Resonators ◽  
Polarization Angle ◽  
Dipole Antennas ◽  
Transmitted Waves ◽  
Angle Rotation ◽  
Transmitting Antenna ◽  
Antenna Polarization ◽  
Polarization Converters

AbstractIn this paper, an antenna-to-antenna method to design high-efficiency polarization converters was proposed. Two in-linked split ring resonators (SRRs) were used as the fundamental unit cell, which can effectively make the original linear polarization angle deflected into a customized one (include but not limited to 90°). The same as the process of energy reception and transmitting of microstrip symmetric dipole antennas, the top SRR plays the role of a receiving antenna and the bottom one acts as a transmitting antenna. Under normal illumination, the strong coupling between electric resonance and magnetic resonance can result in high transmission and broad bandwidth. Since the two SRRs act as two independently polarization selective components, the polarization angle of transmitted waves can be easily controlled by rotating the transmitting SRRs around the center. The proposed concept and the design method are validated using numerical simulations, as well as experimental results of three examples for 45, 60 and 90° polarization angle rotation, the polarization conversion ratio of which is about 92.2, 88.9 and 91.9% from 7.5 to 10 GHz.

scholarly journals Topology optimization of induction heating model using sequential linear programming based on move limit with adaptive relaxation

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 845-850 ◽  
Author(s):  
Hiroshi Masuda ◽  
Yutaro Kanda ◽  
Yoshifumi Okamoto ◽  
Kazuki Hirono ◽  
Reona Hoshino ◽  
...  
Keyword(s):  
Linear Programming ◽  
Topology Optimization ◽  
Induction Heating ◽  
High Efficiency ◽  
Magnetic Energy ◽  
Design Method ◽  
Point Of View ◽  
Sequential Linear Programming ◽  
Electrical Machinery ◽  
Heating Model

AbstractIt is very important to design electrical machineries with high efficiency from the point of view of saving energy. Therefore, topology optimization (TO) is occasionally used as a design method for improving the performance of electrical machinery under the reasonable constraints. Because TO can achieve a design with much higher degree of freedom in terms of structure, there is a possibility for deriving the novel structure which would be quite different from the conventional structure. In this paper, topology optimization using sequential linear programming using move limit based on adaptive relaxation is applied to two models. The magnetic shielding, in which there are many local minima, is firstly employed as firstly benchmarking for the performance evaluation among several mathematical programming methods. Secondly, induction heating model is defined in 2-D axisymmetric field. In this model, the magnetic energy stored in the magnetic body is maximized under the constraint on the volume of magnetic body. Furthermore, the influence of the location of the design domain on the solutions is investigated.

Some Issues of BIM Application in Landscape Architecture

2013 ◽  
Vol 368-370 ◽  
pp. 92-98 ◽  
Author(s):  
Sheng Lu ◽  
Fang Wang
Keyword(s):  
Construction Industry ◽  
Landscape Architecture ◽  
High Efficiency ◽  
Design Method ◽  
Digital Age ◽  
Landscape Design ◽  
Digital Resource

With Chinese construction industry into the digital age. BIM became mainstream of design method with its advantages of high efficiency, wholeness and visualization. Landscape Architecture must be aware that BIM application is necessary to development in landscape design, especially Landscape Architecture as a new first level discipline since 2011 in China. On the basis of issues that BIM application encountered in the Chinese construction industry, this paper discuss important issues of BIM application that Landscape Architecture must to be solved firstly, namely the awareness of BIM, BIM standard for Landscape Architecture, software and digital resource.

Design method of high‐efficiency sparse array for ultra‐wideband radar

2016 ◽  
Vol 52 (3) ◽  
pp. 225-226 ◽  
Author(s):  
Kang Liu ◽  
Xin Tu ◽  
Xiang Li ◽  
Yongqiang Cheng
Keyword(s):  
High Efficiency ◽  
Design Method ◽  
Ultra Wideband ◽  
Sparse Array ◽  
Wideband Radar

Design and Analysis of HP-Turbine for Variable Cycle Engine

2010 ◽  
Author(s):  
Zhi-gang Liu ◽  
Xiang-jun Fang ◽  
Si-yong Liu ◽  
Ping Wang ◽  
Zhao Yin
Keyword(s):  
Boundary Layer ◽  
Working Conditions ◽  
High Efficiency ◽  
Stokes Equations ◽  
Design Method ◽  
Thermodynamic Cycle ◽  
Tip Clearance ◽  
Transition Flow ◽  
Compressive Wave ◽  
Stream Surface

A supersonic highly loaded high-pressure turbine with large enthalpy drop was designed for a variable cycle Engine (VCE) in the conditions of both single and double bypass modes in accordance with the similarity principle in the paper. The blade profiles were designed by means of a three-dimensional (3D) profile design method based on S1 stream surface. Then, 3D numerical simulations were performed on the HP turbine of both working conditions with different thermodynamic cycle parameters to confirm the design methods and results. The one-equation turbulence model of Spalart-Allmaras was applied to solve Reynolds’s averaged Navier-Stokes equations and the transition model of Abu-Ghanam Shaw (AGS) was introduced to capture the development process of boundary layer on blade surfaces in the simulations. The results of simulations indicate that the turbine performances are satisfactory in both working conditions with high efficiency and the design targets being anticipated have been achieved. The method of design profiles based on S1 stream surface is more precise and effective than conventional cylinder method for turbine blade because the 3D characteristics of flow field are considered elaborately. Further research reveals wave structures in the supersonic turbine, behavior of tip clearance flow, the phenomenon of transition flow in boundary layer and the physical mechanism of strong compressive wave-boundary layer interactions.

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